MuPad noob question - writing and reading files

Hi there,

I've installed mupad and have a study guide showing me how it works. But i can't get a file that i wrote using the write("filename") statement to read in and execute the commands in that file. FOr example:

i make a very tiny file with a write and read and this is what it all looks like:

a:=6;
6

write("tst.1");

read("tst.1");

extsubsop

After the read , aren't i meant to see the a:=6 and write("tsp.1") lines? Instead I see this weird line with the word "extsubsop" ?